A. Subdivisions. At the time of approval of the tentative tract map, revised tentative tract map, tentative parcel map or revised tentative parcel map for residential use, the advisory agency shall determine and include as a condition of approval, pursuant to this chapter, that the subdivider shall dedicate land, reserve land, pay a fee in-lieu, or a combination thereof at the option of the advisory agency, for park or recreational purposes. However, where there is a large lot tentative tract or parcel map, such as lots consisting of twenty acres or more, with the intention of future subsequent subdivision, the requirements of this chapter may be deferred until the time of subsequent subdivision, subject to the advisory agency making the following findings: